The Logic Off Topic list

To anyone that can help, I have been creating my own sequences on 
Logic 5 using the Matrix edit and the mapped drums/ grandpiano etc 
channels. What I would like to know is how to create my own sequences 
using my own bass/synth/vocal samples. I created an Audio object in 
an audio channel and created a matrix but i could not work out how to 
import my own synth/bass notes and vocals onto the matrix to create 
my own sequences with them. I clicked on the menu and i saw Import 
Audio File on the matrix screen but it was faded which meant it was 
not accessible. Can you tell me how to do  create my own sequences on 
the matrix with my own Wave files from my hard drive please? Also how 
do I work the exs24 to create my own sequences and what else can i do 
on it? Thanks for your help.